Lopez — who showed off her post-baby bod in a one-shoulder Alberta Ferretti frock — hobnobbed with pals Tom Cruise and Katie Holmes and David and Victoria Beckham at the bash. (She even gave Posh Spice a big hug!)

Lopez and Anthony welcomed their babies February 22 in New York's Long Island.

She has said she's unsure whether she’ll be a working mom.

"I don't know — and I like that, because my life has been so planned for so many years," she told Harper's Bazaar.

She's signed on for the movie Love and Other Possible Pursuits, which begins shooting later this year.